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I have been trying for several days now to get the Ultimate GPS Breakout. Doing a cat /dev/ttyUSB0 shows me the data coming from the GPS receiver, so that says that that the GPS receiver is working, the USB console cable from Adafruit is working and the data is making it to the RPi.

Using the cgps -s command gives me the data coming from the receiver and also points to things are working.

I have added the following lines to /etc/ntp.conf and have restarted the ntp service -

I have checked several resources that got me started on this journey and I dont see anything different. I have to be closed but havent been able to find the problem. I have started with a new Raspian SD card several times and get the same result.

After initially posting this message, I looked at /var/log/syslog and found this line -

After posting this message, I removed the following lines from my ntp.conf -

server 127.127.28.1 minpoll 4 preferfudge 127.127.28.1 refid PPS

Still cant get the time from GPS to show up on the clock.

Since I am not trying to do PPS, is the shm driver still something I need to use ?All the troubleshooting I have done doesnt give me any idea of what is causing the problem of the time feed from GPS receiver not making it to the clock on the RPi.

If you have gpsd running I'm pretty certain shm is the way to go (but don't quote me). I had similar problems when I tried to have two programs (ntpd and gpsd) accessing the hardware at once. If you're using the NMEA driver, you only need ntpd. Make sure you create the udev rules to symlink /dev/ttyUSB0 to /dev/gps0.